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21.7.3.

. 21.6 , . . , , : IEEE 488-1975, - IEC 66.22, . .

(General Purpose Interface Adapter, GPIA) 68488 , - . , . - . 21.32.

. - . ATN (Attention). - , , . RFD (Ready for Data), DAV (Data Valid) DAC (Data Accepted). : , .

. 21.33 . , RFD. , . , . , , , .

. 21.32. . ( ).

. 21.33 (. ) - .

DAV = 0. , DAC. .

. . , , . -, .

, . , . . . , 200

, , , ASCII. , 2 3 . 21.15, - 4 5. , 5 . , 4. . . , . ,

, . ASCII , , .

. 21.34 -. 7 8 .

- 7. 4. . . . 4 , . . .

. 21.34. (. ) - . - - .

5 ASCII. .

, . , . . 21.35 . 1200,6. . .

, . , . . , . .

. , .

, . ,

. 21.35. .

, . , . . , .

. .

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